English paper piecing is a sewing technique that uses paper patterns to hold the patchwork shape. Fabric is “wrapped” around the shape and then held with temporary basting stitches. After the pieces are stitched together to form a block, the paper is removed.
English paper piecing is sometimes referred to as foundation piecing (fabric is sewn to a foundation) or paper piecing (fabric is sewn to a pattern). An argument can be made that all 3 techniques are different but are often used interchangeable.
It is a technique that was (and still is) quite popular in the UK.